Analysis of Piezoelectric Fracture under Combined Mechanical and Electrical Loading based on Meshless Method

Abstract:

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In this paper, the moving least-square (MLS) method, one of the most promising meshless
methods, is modified to construct whole field meshless approximation for coupled
electromechanical problems. Based on this method, the crack propagation behavior and the
elasto-electric fields near a crack tip in a PZT-5H piezoelectric ceramic under mechanical, electrical
and mechanical-electrical mixed loads are investigated. The numerical results show that for a
negative applied electric field, the hoop stress will be maximum at a certain angle other than 00
when the ratio of the electric field to tensile stress is relatively high, which makes the crack turn
away from its original growth path.